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I have a possibly interesting issue to show.
I use InDesign to create my sheet music editions that I then publish here. I create the musical score in Avid Sibelius, export it to PDF, then write the text in Word, format it, then build everything in InDesign (17.x for today's example). Once ready, I export it to PDF for those services that need a PDF and to EPUB for—sigh—Apple Books.
Leaving out the fact that most of the time any EPUB that I export is always containing images of more than 4 million pixels (which I normally solve by lowering resolution to 150ppi), the issue today was this one:
Not understanding what this meant I asked Apple for help, they replied:
Bottom line: for the curious, the only way I could publish this to Apple Books was the following ridiculous procedure:
Since there is no such thing as a perfect, packaged ebook creator — if you ignore PDF — then the only way to get to "perfect" ebooks (beyond the very simplest ones) is to understand the component tech. You can go over into the Build-A-Book side of things, using EPUB tools that access and manage the structure, but even there you'll need a good understanding of XML, X/HTML and CSS.
I prefer to let the publication tools do their job and then tweak the result. Using CSS (with the necessary understanding of how it works in HTML, without necessarily mastering the latter) has proven to be the most efficient path for me. (But then, I do have a high mastery of web technologies, so I admit some preferential bias may be at work.)
I suggest, most 'umbly, that my new(ish) book is the best text and guide to the latter approach, and isn't without some CSS basics. The only other choice I know of is to sort out the vast pile of stuff on the web, of which a great deal is outdated but doesn't say so, and much of the rest takes... rather individualized approaches. But the best (free) place to learn HTML and CSS is, IMVHO, W3schools, at https://www.w3schools.com/ . I use it frequently for technical reference.
Is it known why InDesign adds these PNG files (yes, fixed EPUB)? Do they serve any purpose at all? Any way to avoid their creation or to reduce their sizes without unpacking EPUB > reducing file-size > repacking with eCanCrusher or other apps?
Besides, I have also noticed that one of these files contains bullets from a bullet-list, and being the symbol a bit to the left of the column margin, it gets cut out in the EPUB (but not in the PDF).
As Rayek has noted, ID's export to EPUB is... imperfect. Unfortunately, it's worse for FXL... but few notice because ID to Fixed EPUB docs tend to work very well out there in EPUB-reader land. They're just more bloated and complicated than necessary.
ID is much better at reflowable, especially if you master the techniques of getting there in multiple stages. To create an ID doc and expect it to "print" to EPUB without flaws is misguided, not because ID is flawed but because of all the issues with EPUB itself. Adobe chose one overall route, and it works well enough... but it's not "perfect."
As I've noted, I prefer to work in a high-end writing, eidting and publication tool and deal with format issues downstream. Many do it from the other end, taking writing and graphic elements and assembling it using "construction" tools. I guess it depends on whether you're the writer or the publisher, or which hat you think is dominant; I'm both, and prefer to work at books as an author or editor, not as a... Linotype operator. 🙂